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4 years ago

Simplify.[2 × (10 + 5)] - 5

Mathematics

2 answers:

Sloan [31]4 years ago

7 0

$[2 \times (10 + 5)] - 5 \\ \\ 2 \times 15 - 5 \\ \\ 30 - 5 \\ \\ 25 \\ \\ Answer: \fbox {C) 25}$

N76 [4]4 years ago

4 0

2(10+5)−5 =(2)(15)−5 =30−5 =25 C is the answer.

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Solve each quadratic equation by factoring with grouping. 5v2 – 18v = -9

djyliett [7]

Answer:

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Step-by-step explanation:

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Combime like terms to create an equivalent expression -2.5(4x-3)

Ann [662]

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Step-by-step explanation:

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3 years ago

Which of the following is an extraneous solution of (45-3x)^1/2=x-9?

Iteru [2.4K]

Answer:

C. x =3

Step-by-step explanation:

Extraneous solution is that root of a transformed equation that doesn't satisfy the equation in it's original form because it was excluded from the domain of the original equation.

Let's solve the equation first

$\sqrt{45-3x} = x-9\\Taking\ square\ on\ both\ sides\\{(\sqrt{45-3x})}^2 = {(x-9)}^2\\45-3x = x^2-18x+81\\0 = x^2-18x+81-45+3x\\x^2-15x+36 = 0\\x^2-12x-3x+36 = 0\\x(x-12)-3(x-12) = 0\\(x-3)(x-12)\\x-3 = 0\\=> x =3\\x-12 = 0\\x = 12\\We\ will\ check\ the\ solutions\ one\ by\ one\\So,\\for\ x=3\\\sqrt{45-3(3)} = 3-9\\\sqrt{45-9} = -6\\\sqrt{36}= -6\\6\neq -6\\For x=12\\\sqrt{45-3(12)} = 12-9\\\sqrt{45-36} = 6\\\sqrt{36}= 6\\6=6$

Hence, we can conclude that x=3 is an extraneous solution of the equation ..

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4 years ago

Which value of x satisfies the inequality 108/x less than 8

Zolol [24]

108 27
------ < 8, or 108 < 8x, or (108/8) < x, or x > -----
x 2

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4 years ago